Ultrasonic Measurement of Particles in a Viscous Fluid.
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF OCEAN ENGINEERING
Pagination or Media Count:
A fluid model has been designed and built to simplify the more complex study of particle dispersion in polymer melts. Focussed ultrasound is employed for maximum acoustic intensity within the focal zone for high resolution of particles between the diameter ranges of 100 - 10 microns. The theory of focussed radiators is discussed with emphasis on obtaining a minimum focal zone and beam width. The parameters necessary for particle detection in a viscous fluid are highlighted. A signal processing system has been designed and implemented to allow quick, accurate, and reliable data acquisition with speeds up to 10 KHz. Incorporated in this system is the use of state-of-the-art peak detectors which gate, digitize and store, for computer pick-up, the largest signal within the gated zone. Preliminary tests have shown that glass spheres between the range of 15 - 10 microns are detectable in silicone oil. Results of these tests have been plotted, as well as results from particles in the ranges of 25 - 15, 35 - 25 micron glass beads and 32 micron polystyrene beads. Theses.
- *SIGNAL PROCESSING
- *ACOUSTIC MEASUREMENT
- PARTICLE SIZE
- PEAK VALUES
- STATE OF THE ART
- ACOUSTIC DETECTION
- HIGH RESOLUTION
- DATA ACQUISITION
- ACOUSTIC BEAMS
- Test Facilities, Equipment and Methods
- Acoustic Detection and Detectors